fix: include owner role in gem owner

lib/rubygems/commands/owner_command.rb

@@ -79,7 +79,8 @@ def show_owners(name)
 
       say "Owners for gem: #{name}"
       owners.each do |owner|
-        say "- #{owner["email"] || owner["handle"] || owner["id"]}"
+        identifier = owner["email"] || owner["handle"] || owner["id"]
+        say "- #{identifier} (#{owner["role"]})"
       end
     end
   end

test/rubygems/test_gem_commands_owner_command.rb

@@ -32,9 +32,12 @@ def test_show_owners
 - email: user1@example.com
   id: 1
   handle: user1
+  role: owner
 - email: user2@example.com
+  role: maintainer
 - id: 3
   handle: user3
+  role: owner
 - id: 4
 EOF
 
@@ -48,9 +51,9 @@ def test_show_owners
     assert_equal Gem.configuration.rubygems_api_key, @stub_fetcher.last_request["Authorization"]
 
     assert_match(/Owners for gem: freewill/, @stub_ui.output)
-    assert_match(/- user1@example.com/, @stub_ui.output)
-    assert_match(/- user2@example.com/, @stub_ui.output)
-    assert_match(/- user3/, @stub_ui.output)
+    assert_match(/- user1@example.com \(owner\)/, @stub_ui.output)
+    assert_match(/- user2@example.com \(maintainer\)/, @stub_ui.output)
+    assert_match(/- user3 \(owner\)/, @stub_ui.output)
     assert_match(/- 4/, @stub_ui.output)
   end